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MAX4308ESA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4308ESA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page 400MHz, Ultra-Low-Distortion Op Amps 10 ______________________________________________________________________________________ 12 -8 -6 0.1 1 100 10 1000 0 FREQUENCY (MHz) 6 10 -2 -4 2 4 8 RS = 0Ω AVCL = +1 CL = 15pF CL = 5pF CL = 10pF Figure 2a. MAX4108 Response vs. Capacitive Load—No Resistive (RS) Isolation (circuit shown in Figure 1a) 20 0 0.1 1 100 10 1000 8 FREQUENCY (MHz) 14 18 2 6 4 10 12 16 RS = 0Ω AVCL = +2 CL = 5pF CL = 10pF CL = 15pF Figure 2b. MAX4109 Response vs. Capacitive Load—No Resistive (RS) Isolation (circuit shown in Figure 1a) 4 -6 -5 0.1 1 100 10 1000 -2 FREQUENCY (MHz) 1 3 -3 -4 -1 0 2 CL = 15pF CL = 5pF CL = 10pF RS = 0Ω AVCL = +5 Figure 2c. MAX4308 Response vs. Capacitive Load—No Resistive (RS) Isolation (circuit shown in Figure 1a) 4 -6 -5 0.1 1 100 10 1000 -2 FREQUENCY (MHz) 1 3 -3 -4 -1 0 2 CL = 15pF CL = 5pF CL = 10pF RS = 0Ω AVCL = +10 Figure 2d. MAX4309 Response vs. Capacitive Load—No Resistive (RS) Isolation (circuit shown in Figure 1a) Driving Capacitive Loads The MAX4108/MAX4109/MAX4308/MAX4309 are opti- mized for AC performance. They are not designed to drive highly reactive loads. Reactive loads will decrease phase margin and may produce excessive ringing and oscillation. Figure 1a shows a circuit that eliminates this problem, and Figure 1b is a graph of the optimal isolation resistor (RS) vs. capacitive load. Figures 2a–2d show how a capacitive load causes excessive peaking of the amplifier’s bandwidth if the capacitive load is not isolated (RS) from the amplifier. A small isolation resistor (usually 15 Ω to 22Ω) placed |
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